The word "pt" is actually a common abbreviation for "platinum." Let's break it down for you:
Platinum (pt) is a heavy, precious metallic element. It is grey-white in color and is very resistant to corrosion. Platinum is often used in jewelry, electronics, and various industrial applications.
In more advanced contexts, "pt" or "platinum" may be used in discussions about investment (platinum as a commodity), or in chemistry, where it can be represented in chemical equations.
There are no specific idioms or phrasal verbs directly related to "platinum" or "pt." However, you might hear terms like "platinum level" in discussions about rewards or status, indicating something of high quality or value.